python scapy.all file not found

Question

I have tried to run my program, and I have tried import scapy then import scapy.all but is will give me the same error. I am using kali-linux if that helps. The code that is causing the error is just from scapy.all import *

This is the full error output:

Traceback (most recent call last):
  File "/home/bradz/test.py", line 24, in <module>
    from scapy.all import send, IP, TCP, ARP
  File "/usr/local/lib/python3.9/dist-packages/scapy/all.py", line 16, in <module>
    from scapy.arch import *
  File "/usr/local/lib/python3.9/dist-packages/scapy/arch/__init__.py", line 27, in <module>
    from scapy.arch.bpf.core import get_if_raw_addr<br/>
  File "/usr/local/lib/python3.9/dist-packages/scapy/arch/bpf/core.py", line 30, in <module>
    LIBC = cdll.LoadLibrary(find_library("libc"))
  File "/usr/lib/python3.9/ctypes/util.py", line 341, in find_library
    _get_soname(_findLib_gcc(name)) or _get_soname(_findLib_ld(name))
  File "/usr/lib/python3.9/ctypes/util.py", line 147, in _findLib_gcc
    if not _is_elf(file):
  File "/usr/lib/python3.9/ctypes/util.py", line 99, in _is_elf
    with open(filename, 'br') as thefile:
FileNotFoundError: [Errno 2] No such file or directory: b'liblibc.a'

Fixed it. You need to go to:

/usr/lib/python3/dist-packages/scapy/arch/bpf/core.py

and edit the line

LIBC = cdll.LoadLibrary(find_library("libc"))

to

LIBC = cdll.LoadLibrary(find_library("c"))

[Another victim](https://stackoverflow.com/questions/65410481/filenotfounderror-errno-2-no-such-file-or-directory-bliblibc-a). — Carcigenicate, Dec 22 '20 at 14:56
tryed to roll back to an older version and it still has the same issue but as well it works fine in python2 not python3 — Kermit Püterßmit, Dec 22 '20 at 15:14
With the same version of CPython, a rollback won't work. You'd need to either roll back your Python version, or update Scapy (the preferred way). — Carcigenicate, Dec 22 '20 at 15:17
Fyi, you could post your workaround as an answer. It would be far more appropriate there. — Carcigenicate, Dec 22 '20 at 15:33

Carcigenicate · Accepted Answer · 2020-12-22T15:26:21.857

This appears to have been a bug in the library that was fixed 11 days ago:

There is a regression in Python 3.9 with the find_library() function:

>>> import ctypes.util
>>> ctypes.util.find_library("libc")
 Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
   File "/usr/lib/python3.9/ctypes/util.py", line 341, in find_library
     _get_soname(_findLib_gcc(name)) or _get_soname(_findLib_ld(name))
   File "/usr/lib/python3.9/ctypes/util.py", line 147, in _findLib_gcc
     if not _is_elf(file):
   File "/usr/lib/python3.9/ctypes/util.py", line 99, in _is_elf
     with open(filename, 'br') as thefile:
 FileNotFoundError: [Errno 2] No such file or directory: b'liblibc.a'

A workaround is to use find_library("c") instead. It also works in older versions of Python and that's already what's used in contrib/isotp.py.

Update scapy since you appear to be using a version of scapy that is incompatible with your version of CPython.

Actually, it looks like PyPI hasn't been updated yet, so you won't be able to update through pip. You may need to rollback your Python version until it's updated, or manually install the patched scapy version from Github.

python scapy.all file not found

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